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While Microsoft still isn't commenting on whether current Windows Mobile phones will be upgradeable to its new Windows Phone 7 software, it has finally officially revealed that existing applications won't work on the new platform.

"To deliver what developers expect in the developer platform we've had to change how phone apps were written. One result of this is previous Windows mobile applications will not run on Windows Phone 7 Series," wrote Charlie Kindel, partner group program manager for the Windows Phone application platform and developer experience at Microsoft, in a blog post late on Thursday.

That's because with Windows Phone 7, Microsoft has decided to use Silverlight and XNA as development platforms. Silverlight is Microsoft's multimedia runtime that competes with Adobe's Flash. XNA is the platform for developing games for the Xbox 360.

"If you are a Silverlight or XNA developer today you're gonna be really happy," Kindel wrote.

That appears to be true, judging from comments posted during and after a Twitter question-and-answer with the Windows Phone team at Microsoft about the news.

"Very good news for any #silverlight and #xna developer :)," wrote Pawel Bojkowski, a developer, on Twitter.

Johan van Mierlo, a Microsoft MVP for Windows Mobile Devices, also wrote that he approves of the change. "IMO this is all good!" he wrote on Twitter.

The move to Silverlight shouldn't be a big surprise for most developers. "Microsoft has always said, 'Learn Silverlight, it's an important development environment for the future,'" said Matt Rosoff, an analyst with Directions on Microsoft, in a recent interview.

Plus, Microsoft hasn't really pushed its Windows Mobile 6.5 Marketplace very hard, he noted. That may have given developers a clue that changes were afoot.

Microsoft, however, says it isn't abandoning the Windows Mobile platform just yet. "To be clear, we will continue to work with our partners to deliver new devices based on Windows Mobile 6.5 and will support those products for many years to come, so it's not as though one line ends as soon as the other begins," Kindel wrote.

What is still uncertain is whether any phones currently on the market will be upgradeable to Windows Phone 7. Microsoft has been coy on that matter, presumably because it doesn't want to jeopardize sales of current-generation products between now and when Windows Phone 7 products hit shelves later this year.

During the Twitter question-and-answer on Thursday, the Microsoft employees did not shed any light on the matter. They mostly repeated the official response from the company, which is that it can't confirm if users will be able to upgrade from Windows Mobile 6.5.

They also repeated another vague statement about whether the HTC HD2 will be upgradeable. "Currently we don't have plans to update the HTC HD2 to WP7," the Windows Phone 7 team wrote on Twitter. The HD2, a phone with one of the largest screens of any phone on the market, will run Windows Mobile 6.5 when T-Mobile starts selling it. The operator has said the phone should hit the shelves in the spring, which in the U.S. is the second quarter.

Slideshows

ARN Exchange: Channel discusses security spending priorities

Customers spending priorities, drawing up a security strategy for customers and partners, detailing how partners can increase profit through security and outlining key areas of market growth ahead were some of the topics discussed at the ARN Exchange event in Sydney. Partners got together to talk about the spending priorities of customers within the security market today and the skills required from partners to deliver those services. The event was in association with Juniper Networks, Webroot, Cloud Plus and Mimecast. Photos by Christine Wong.

What are the spending priorities of customers within the security market today and what are the skills required from partners to deliver those services? An overview of the security market in Australia was debated in the ARN Exchange event in Melbourne with discussions covering the customers spending priorities, drawing up a security strategy for customers and partners, detailing how partners can increase profit through security and outlining key areas of market growth ahead. The event was in association with Juniper Networks, Webroot, Cloud Plus and Mimecast. Photos by Raymond Korn.

The channel came together for the forth running of the ARN Emerging Leaders Forum in Australia, created to provide a program that identifies, educates and showcases the upcoming talent of the ICT industry.
Hosted as a half day forum, attendees heard from industry specialists as keynoters and panellists discussed leadership paths and career choices. Hall of Fame members and industry mentors​ hosted small groups of future leaders to mentor and advise.
This also marked ARN's inaugural 30 Under 30 Tech Awards, which recognised young talent in the Australian IT industry across technical, sales, marketing, management, human resources and entrepreneur categories.
Photos by Christine Wong.

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